What kind of NAT'ing, if any, is there between the host on which
this run was made and the Internet? Very briefly explain.

Based on the kind of NAT, does it appear possible for this host to communicate
directly with another NAT'ed host (on a different network)? Very briefly explain.

Optional bonus question: where (physically) do you think the STUN server that was used
might be? (Hint: nslookup, whois.) (Another hint:
not so fast...)

Consider building an Internet-sized network using (just) bridges
and the spanning tree algorithm.

How does the total number of hosts on the (spanned) network
limit scalability? (Give a short but specific answer.)

How does the rate at which hosts come online and go offline
limit scalability?

How does maximal latency in the network limit scalability?

How does the number of ISPs that exist in the world limit
scalability?

How does the desire to make efficient use of links limit
scalability?

The man on the street "knows" that there are two kinds of IP addresses,
static and dynamic, and thinks that if a machine has a dynamic address it
may change from time to time (while a static one will not).
In fact, addresses assigned dynamically, though DHCP, may not change - DHCP
can be set up so
that a machine is guaranteedd to get the same IP address every time it
boots.

Why would you want to (a) have the same address every time the machine
is booted, but (b) at the same time want to assign the address dynamically
(i.e., using DHCP)?